Adjustable lamp standard



June 16,1936. E. SCHWARZ ADJUSTABLE LAMP STANDARD Filed Jan. 21, 1935 IN VENTOR fusE/vejcH WA Rz,

- iiiiiiflfliiiiiiliiiitmllllll I llllll' ATTORNEY Patented June 16, l33

Nil STATS OFFICE ADJUSTABLE L STANDARD Application January 21, 1933, Serial No. 652,859

4 Claims.

The. invention relates to adjustable electricallamp standards of a type wherein one part or" a standard telescopes within another part thereof, objects of said invention being to facilitate vertical movements of the lamp-carrying element, to avoid wearing or abrasion of the electrical conductor which supplies the lamp with its current, to render easy the production and the assembling of the component elements of the standard, as well as to secure a rigid union of said elements, and to give to the standard a desired ornamental appearance.

The invention is illustrated in the accompanying drawing, in which- Figure 1 is a view in elevation of the entire standard, parts thereof being broken away to reveal internal features of construction;

Figure 2 is a similar view showing the adjustable element of the standard in its lowest position;

Figure 3 shows parts of enlarged;

Figure 4 is a vertical sectional view showing the construction of the base of the standard, and

Figure 5 is a vertical sectional view, showing a modification.

Referring to Figures 1 and 2 of the drawing, I is the base of the standard, through which the insulated conductors 2 extend, these conductors being provided with the usual plug 3, and said base having feet 4 between any two of which said conductors may lie. Supported by and extending upward from the base I is a tube 5 constituting the fixed part of the standard relatively to which telescopes the hollow vertically-adjustable element 6 carrying the casting l and the arm 8 on which the bulb 9 is supported. A tubular casting l9 surmounts the upper end of said tube 5, and this casting is provided with a thumb screw l l which engages a groove Ila in the outer wall of the tube 6 and operates to hold said tube in any desired elevated position.

Said casting may also be provided with a set screw lib to prevent turning of said verticallyadjustable element 6 when the thumb screw H is withdrawn. The tube 5 may be united to said casting i S by inserting its upper end in the mold in which said casting is formed, said upper end being provided with irregularities Illa with which the metal constituting said casting may interlock.

The casting l and the tube 6 extend one into the other, as shown in Figure 1 and are fixedly united in any suitable manner, but, in order to the device, somewhat enable them to be readily assembled and separated, their union may be effected by the means shown in Figure 5 wherein an inner tube [2, which acts as a tie-rod, is suitably secured at its upper screw-threaded end I2a in said casting l, and at its lower end carries a nut l3 having an external flange lSa on which said tube 6 rests. By tightening said nut said tube 6 will be forced upward against the lower surface of said casting l and thus securely held in position. 10

The lowered position of said vertically-adjustable element 6 is determined by the top of the ornamental tubular casting I0 on which the ornamental tubular casting 7 then rests, while the highest position of said element 6 is determined by the screw H with which the lower end [5 of the groove Ila engages.

The lower end of the fixed tube 5 has ribs l6 and is surrounded by a casting l'l constituting a part of said base i. Other parts of said base are hollow castings l8, l9 and 20, all of which are held together by a tube 2| having exterior ribs 22 which engage the metal of said casting I1, and having also a screw-threaded lower end 23 which engages an interior screw-thread of the 25 casting 20.

The conductors 2 extend upward through the fixed tube 5., within which they are formed into a coil 2a within which is disposed a reverselycoiled spring 24 which opposes the elongation of the coil 2a and prevents it from un-coiling. This spring 24 has conically-coiled ends 25 which firmly grasp and indent the rubber coating 26, to thereby hold said spring 24 and said coil 2a in proper relations to each other.

The convolutions of the coil 2a are covered with a thin coating of rubber 26 instead of fabric or metal, the reason for using rubber being that rubber, unlike fabric, resists abrasion, and, unlike metal, being flexible, does not materially resist the required elongation or contraction of the coiled conductor.

In assembling the parts of the base, molten metal is poured into a mold and around the ribbed end it of the fixed tube 5, and also around the ribbed portion 22 of the tube 2|, thus producing the casting ll which unites said fixed tube 5 and said tube 2!. The fixed element or tube 5 is, preferably, a very thin tube which is incapable of being screw-threaded, although it may be readily provided with the ribs IE or similar irregularities which will engage the metal of the casting ll. The tube 2! which is considerably smaller than the tube 5, extends upward Within said tube 5 to such a point that the molten metal Will not overflow into it, although it will rise between the concentric ends of said tubes and add strength at the point where strength is required. The thin tube 5 if especially weak might yield to strains if not thus reinforced. The assembling of the parts is completed by placing the elements l8, l9 and 2B of the base I in their proper positions and screwing the lower end of the tube 2| into the element 20, and by fixedly attaching the upper end of the fixed tube 5 to the casting I0 in any usual manner.

Having thus described my invention, what I claim is:

1. An adjustable lamp standard, including a base, a fixed tubular element rising from said base, a vertically-adjustable tubular element telescoping with the said fixed tubular element, and rubber-coated conductors having coils se-- cured to a reversely-coiled spring and disposed within one of said tubular elements.

2. An adjustable lamp standard, including a base, a fixed tubular element rising from said base, a casting surmountingv and interlocked with said tubular element,la vertically-adjustable tubular element telescoping with said casting, a

head surmounting said vertically-adjustable tubular element, a tubular tie-rod disposed within said vertically-adjustable tubular element and engaging said head, a nut secured to the lower end of said tie-rod and directly engaging the lower end of said vertically-adjustable tubular element, and conductors extending through said tubular tie-rod.

3. An adjustable lamp standard, including a tubular element, a coiled conductor disposed within said tubular element, and a reverselycoiled spring attached at its upper and lower ends to said coiled conductor for preventing said coiled conductor from uncoiling.

4. A lamp standard including a thin metal tube having an annular; rib at its lower end, a smaller tube having an annular rib and extending upward into the lower end of said thin metal tube, and a casting surrounding a part of said smaller tube and engaging the rib thereof, the upper end of said casting being disposed around the rib of said thin metal: tube and extending into the space between the lower end of said thin metal tube and said smaller tube.

EUGENE SCHWARZ. 

